.120" certainly sounds like a firering not an o-ring.

 

actually the firerings on this 12v head I got are .120 square cut.

 

Tate - where did you get o rings cut in Nisku? did they do a good job?

 

I recall tate wasn't too happy with the job they did on his head. but I don't recall the name of the place.

 

Thx Luke.

 

The head that Tate's using on his dually was cut for orings down in Vancouver. The dually head is from PDR. It think that he got a 12v head and Kev got those head done in Nisku. The cut wasn't consistant depth and they had to use different wire thickness.

Luke, wow that head really needed to have the ports cleaned up so you can flow some air into the cylinders. I forgot how the bad the casing is a stock head is. My heads have at least had a bowl porting done. When I get my 12v head back from the machine shop, I'll take a picture for everyone to see.

 

It was Trac Engine in Edmonton that did it. Poor work, IMO, but it did keep sealed when Kev grenaded his block, so that must say something. Groove depth and widths were very inconsistant. BigD450 also had his head done there, and it still holding.